Frustrated missing

#1
Briggs 3.5 flathead was missing.
Rebuilt block with new piston rings and lapped valves!
Good compression!
After rebuild had to pirme carb to get it to start each time i would start it!
Would stay running but a little sluggish and very laggy!
Cleaned carb and tank , pick up tube firm and clean. New diaphragm. The pickup bowl was full.
Cleaned screen on tube and in pick up bowl screen. Ran small thin wire up the jet that goes into pick up bowl.

Engine ran better but Laggy and would miss under quick acceleration. Died a couple of time but would start if choked and pulled several times.
Choke had no affect while running.

Gurr ,,, about to switch carb off 5 hp . Same carb

Any ideals ?
 
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